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Dynamics of glomerular ultrafiltration .9. Effects of plasma-protein concentration

Academic Article
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Overview

authors

  • Baylis, C.
  • Ichikawa, I.
  • Willis, W. T.
  • Wilson, Curtis
  • Brenner, B. M.

publication date

  • 1977

journal

  • American Journal of Physiology  Journal

abstract

  • Experiments were carried out on 42 Munich-Wistar rats with surface glomeruli accessible to micropuncture to investigate the effects of reduction in systemic plasma protein concentration. CA, and thus afferent oncotic pressure, IIA, on the determinants of glomerular ultrafiltration. In animals in which CA was reduced by a variety of maneuvers, observed values for single-nephron GFR were lower than values predicted by the Starling relation, when the latter were calculated assuming that the observed increase in the net driving pressure for ultrafiltration (due to the reduction in IIA) was the only factor perturbed. In all experimental conditions where CA was reduced, rats were invariably observed to be at filtration pressure disequilibrium, permitting calculation of unique values of the ultrafiltration coefficient, Kt. In all low-CA groups, mean values of Kf were uniformly lower than values obtainedin normoproteinemic control animals. The failure of SNGFR to rise to predicted values when CA is reduced is therefore due to the concomitant reduction in Kf. No morphological basis for this reduction in Kf was discerned.

subject areas

  • Animals
  • Blood Proteins
  • Capillaries
  • Glomerular Filtration Rate
  • Inulin
  • Kidney
  • Kidney Glomerulus
  • Microscopy, Electron
  • Protein Deficiency
  • Rats
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Identity

International Standard Serial Number (ISSN)

  • 0002-9513

PubMed ID

  • 835714
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Additional Document Info

start page

  • F58

end page

  • F71

volume

  • 232

issue

  • 1

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